/*
 * Copyright (c) 2008, 2020 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0, which is available at
 * http://www.eclipse.org/legal/epl-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception, which is available at
 * https://www.gnu.org/software/classpath/license.html.
 *
 * SPDX-License-Identifier: EPL-2.0 OR GPL-2.0 WITH Classpath-exception-2.0
 */

package org.glassfish.grizzly.utils;

/**
 * General initializer interface.
 *
 * It might be useful abstraction, which helps to create and initialize certain values lazily.
 *
 * @see org.glassfish.grizzly.attributes.Attribute
 * @see org.glassfish.grizzly.attributes.AttributeHolder
 * @see org.glassfish.grizzly.utils.Holder
 *
 * @author Ken Cavanaugh
 */
public interface NullaryFunction<T> {
    /**
     * Initializes and returns the value.
     */
    T evaluate();
}
